Returning a value from a method within a lambda expression

Question

I\'m trying to figure out how to return a method value from a lambda expression:

public int findMissingNumber(Collection ints) {
    Single<         


        

Answer 1

Is there some type of way to break or force a return for the entire method?

No. At least, not unless you throw an exception.

Basically, that's not what forEach is meant for. You could write a method which accepted a function which would return null for "keep going" and non-null for "stop, and make this the result"... but that method isn't forEach.

The fact that you're using a lambda expression is really incidental here. Imagine you were just calling forEach and passing in some argument - wouldn't it be really weird if that call made your findMissingNumber method return (without an exception), without the findMissingNumber method itself having the return statement?